Smoke detector



FIG. 1 is a bottom, front, left side isometric view of a smoke detector;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a rear view thereof.

The broken lines illustrate portions of the smoke detector that form no part of the claimed design. 

CLAIM The ornamental design for a smoke detector, as shown and described. 